Super Duplex Steel UNS S32750 Sheets & Plates

What are Super Duplex Steel UNS S32750 Sheets & Plates?

Super Duplex Steel UNS S32750 sheets and plates are flat-rolled products made from super duplex stainless steel with a balanced microstructure of austenite and ferrite. This advanced composition delivers significantly higher strength and corrosion resistance than standard duplex grades.

UNS S32750 is specifically designed for highly aggressive environments where superior performance is required.

Key Functions:

• Provide exceptional strength and structural integrity
• Resist corrosion in extreme environments
• Ensure long service life with minimal maintenance
• Perform under high pressure, temperature, and stress

Chemical Composition of Super Duplex Steel UNS S32750

SS XM-19 has a unique composition that enhances strength and corrosion resistance.

Typical Composition:

• Chromium (Cr): 24% – 26%
• Nickel (Ni): 6% – 8%
• Molybdenum (Mo): 3% – 5%
• Nitrogen (N): 0.24% – 0.32%
• Iron (Fe): Balance
• Manganese (Mn): ≤ 1.2%
• Silicon (Si): ≤ 0.8%

This composition offers outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking.

Key Features of Super Duplex Steel UNS S32750 Sheets & Plates

Stainless Steel XM-19 offers several advantages:

• Extremely high strength (higher than duplex and austenitic steels)
• Outstanding resistance to pitting and crevice corrosion
• Excellent resistance to stress corrosion cracking
• Superior performance in seawater and offshore environments
• High resistance to chloride attack
• Excellent fatigue strength
• Long service life in harsh conditions

Mechanical Properties

• Tensile Strength: ~800–1000 MPa
• Yield Strength: ~550 MPa
• Elongation: ~25%
• Hardness: Moderate to high

Physical Properties

• Density: ~7.8 g/cm³
• Melting Range: ~1350–1450°C • Modulus of Elasticity: ~200 GPa
• Thermal Conductivity: ~14 W/m•K
• Thermal Expansion: Lower than austenitic steels

Corrosion Resistance

Super Duplex UNS S32750 sheets and plates offer exceptional resistance to:

• Chloride-induced pitting and crevice corrosion
• Stress corrosion cracking
• Seawater and marine environments
• Harsh chemicals and acids
• Oxidizing and reducing environments

It significantly outperforms duplex grades like S32205 and standard stainless steels such as 316L.

Heat Treatment

Supplied in solution-annealed condition.

Process:

• Solution Annealing: ~1025–1125°C
• Rapid cooling

Weldability

Super Duplex S32750 offers good weldability with proper procedures.

Welding Methods:

• TIG (GTAW)
• MIG (GMAW)
• SMAW

Best Practices:

• Control heat input carefully
• Use matching filler materials
• Maintain phase balance
• Avoid excessive heat

Machinability

• More challenging than duplex steels
• Requires rigid setup and tooling
• Use sharp carbide tools
• Maintain controlled cutting speeds and proper cooling

Standards & Specifications

• ASTM A240 / ASME SA240
• UNS S32750
• EN 1.4410
• ASTM A480

Available Types of Sheets & Plates

• Hot Rolled Plates
• Cold Rolled Sheets
• Polished Sheets
• Chequered Plates
• Custom Cut Sizes

Sizes & Specificationsc

• Thickness: 0.5 mm to 100 mm
• Width: Up to 2000 mm
• Length: Up to 6000 mm or as required